Physical simulation of multiple scenes simultaneously
It's not possible. The active scene (bpy.context.active_scene, I think) is shared by the whole blender session. 

You could within one scene use several viewports without a problem (check the manual, you click and drag from the \\ section in the lower left corner to create a new viewport and set it to '3d view').

If what you want is a final render with a 3x3 matrix you could render them from separate scenes and merge them using the compositor in a new scene (using translations to move them and scale them to put them at different places on screen).